Keyboard thimble



FIG. 1 is a perspective front view of a keyboard thimble;

FIG. 2 is a front elevation view of the keyboard thimble;

FIG. 3 is a rear elevation view of the keyboard thimble;

FIG. 4 is a left side elevation view of the keyboard thimble; the right side view being a mirror image thereof;

FIG. 5 is a top plan view of the keyboard thimble; and,

FIG. 6 is a bottom plan view of the keyboard thimble. 

CLAIM The ornamental design for a keyboard thimble, as shown and described. 